Egor Hans

Can be seen more clearly in https://www.reddit.com/r/Minecraft/comments/p7ekqa/what_the_heck_is_this_ignore_the_smoker/

Can confirm. Lag builds up within smallest time frames, to the point of OutOfMemoryError crashes without warning. (I have the quadruple of the regular RAM allocated.)

I'd have expected this to be WAI. For all other game modes, the following rule applies: If you fulfill the conditions for an achievement/advancement, you get it, no matter whether you normally should be able to fulfill the condition. And I don't see why Spectator Mode should be an exception, since it will never affect other players. I assume this will end up marked as WAI.

I suppose if that were intended, it would already be marked as WAI.

I consider this a "useful" bug. It allows for some really neat aesthetic shenanigans, as well as really cool hidden passages. I vote for leaving this bug in (and preventing it from causing lag instead if possible).

I've been observing this for ages already. Always thought it's WAI.